2003 Chevy Blazer Mis firing

2003 CHEVROLET BLAZER
94,000 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
DTSHANES
  • MEMBER
  • 1 POST
I just had my 2003 Blazer tuned up and the service engine light is back on and it is still missing at different speeds, kinda chugging and then it stops, it has been doing this for about a month!! I am thinking its something not so complicated, fuel filter o2 sensor?? any words of wisdom?????
Jan 11, 2010 at 8:32 AM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Engine misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
Jan 11, 2010 at 9:30 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.